Controlling system



March 10, 1925- 1,529,151

W. P. ALBERT CONTROLLING SYSTEM Filed June 20, 1922.

Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE. v

WALTER P. ALBERT, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO WESTERN ELEC-TRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A

YORK.

CORPORATION OF NEW CONTROLLING SYSTEM.

Application filed June 20, 1922. Serial No. 569,682,

To all whom it may concern.

Be 1t known that I, IVALTi-iit P. .ALIsER'l, a cltlzen of the UnitedStates, residing at East Orange, in the county of Essex, State of NewJersey, have invented certain new and useful Improvements in ControllingSystems, of which the folowing is a full, clear, concise, and exactdescription.

This invention relates to electrical control devices and more especiallyto devices of this character when adapted tor use in telephone andsimilar systems.

The object of the invention is a control system in which an operatingand controlling relay is actuated in response to local currents inducedor created by changes of current in a line circuit.

A feature of the invention relates to the provision, in a system wherevariably operable switches or similar devices are actuated by a controlrelay, of local circuit-s each i11- cluding a winding of said relay inwhich invention is illustrated as incorporated'in a telephone system. itis' to be understood that controlling mechanisms of this character maybe applied to a wide variety of uses. In the 'pres-' ent instance,however, it is shown as adapted for receiving current impulsestransmitted over a subscribers telephone line to the central oilice andin turn for delivering these impulses to a registering or recordingequipment.

The drawing illustrates a portion of a subscribers telephone line 102.103 entering a central ofiice. In any well known manner this line isextended through a line finder or a line switch either to a trunkleading to a selector switch or to an operators position as desired.Inasmuch as the means for extending the subscribers line forms no esdrawing an electrical control mechanism embodying the principlesot th1sIn its broadest aspect sential part of this invention, the same has notbeen shown.

Since it is desirable to take a record of the impulses transmitted overthe line, there is provided at the central oflicc an impulse receivingand registering apparatus. This registering mechanism comprises amongother elements a plurality of relays 106, 108 and 111 which receive theincoming impulses and deliver them to the registers. There may be anydesired number of registers for receiving the impulse series and alsothese registers may be of any suitable form. 'Iwo registers 110 and 115are shown, each consisting of a step-by-step switch driven by a steppingmagnet 124 or 125. As many other registers as are needed may obviouslybe provided.

In addition to the registers a control switch 120 is employed forassociating the impulse receiving relays in'succession with the severalregister switches so that as soon as one series of impulses is recordedon a given register the next series may be recorded on the succeedingregister.

It is sometimes desirable to provide a plurality of these impulsereceiving and recording mechanisms atthe central oiiice, any one ofwhich may be associated with a subscribers line. To this end a selectingswitch, the brushes 104 and 105 of which are illustrated, is employedfor finding an idle mechanism.

A detail description will now be given of the manner in which the systemoperates. When the subscriber of line 100'initiates a call, the line isextended'through the brushes 104 and 105 of the selector switch to anidle impulse receiving andrecording mecha-, nism. A circuit maythere-upon be traced from battery, through the left-hand winding ofrelay 108, brush 105, conductor 103', over the loop of the calling lineand returning by way of conductor 102, brush 104, through the lett-handwinding of the balancing coil 107 to ground. Current flowing in thiscircuit energizes the left hand winding of relay 108. and also sets up aflux in the lefthand winding of the bal-- ancing coil 107. A circuitalso may be traced from battery, through-the left-hand winding of relay108, condenser 109, lefthand winding of relay 106, leit-hand wind- 1.

produce a charge on the condenser.

is reduced by the shunting action of the circuit traced including theline. Another circuit may be traced from battery, through the right-handWinding of relay 108, middle winding of relay 106, conductor 131, brush112 of the control switch 120, terminal 113, contact of magnet 124,conductor 130, winding of'relay 121, brush 116, terminal 117, condenser126, resistance 127 to ground. The potential applied across theterminals of condenser 126 in the circuit just traced and also throughthe winding of magnet 124 builds up a charge in said condenser. Therelay 106', however, remains inert since suflicient current does notpass through the windings of said relay to cause the operation thereof.Relay 108 becomes energized through its left-hand winding and closes acircuit for the relay 111 which also operates.

When the subscriber manipulates his dial 101 to send a series ofimpulses, the line circuit is opened at the first interruption of thecontacts of the said dial. Immediately that the line circuit opens, theflow of current windings of relay 108 and coil 107 according to wellknown laws induces a high potential which creates a momentary flow ofcurrent. Since the line is open the current of self-induction cannotflow therein and, the

shunt of the line being removed from the condenser 109, the potential ofbattery applied across the condenser 109 through the left-hand windingsof relays 108, 106 and 107, aids the potential'of self-induction to Thischarging potential causes current to flow through the left-hand windingof relay 106.

Likewise the collapse of flux at the relay 108 induces a momentarypotential in the right-hand winding thereof. Since the condenser 126 isalready charged to battery potential, the added higher potential ofselfinduction is sufficient to increase the charge on the saidcondenser, causing a momentary flowof current through the middle windingof relay 106. The combined flow of current through the left-hand andmiddle windings of relay 106 is sufficient to cause said relay toattract its armature. Immediately that the relay 106 operatesa circuitis closed from battery, through the right-hand winding of relay 108,middle winding of relay 106, contact of relay106, contact of relay 111,to ground. Relay 106 looks in this circuit and is held by the steadyflow of current after the momentary current of self-induction dies away.Upon the operation of relay 106, a circuit is established from groundthrough the contact of relay 1111, contact of relay 106, right-handwinding of'relay 106, con;

ductor 130, winding of slow-to-relea-serelay 121, brush 116, terminal117, winding of stepping magnet 124, to battery. At the same time acircuit is also closed from ground through the. contact of relay 111,contact of relay 106, conductor 131, brush 112, terminal 113, contact ofmagnet 124,

winding of relay 121, brush 116, terminal 117, windingof stepping magnet124 to battery. It will be noted that the circuit last traced is inshunt of the previously traced circuit through the right-hand winding ofrelay 106. The stepping magnet 124 becomes energized in this circuit andwhen deenergized advances the brush 122 and such other brushes as may beassociated with the register 110. IVhen the armature of the registermagnet 124 has taken a full forward step, the contact of said magnetopens. The opening of the contact of magnet 124 removes the shunt aroundthe right-hand winding of relay 106, whereu on this righthand winding isincluded directly in series with the winding of stepping magnet 124 andbecomes fully energized.

The right-hand winding of relay 106 is wound in a differential relationwith the other windings of said relay. Hence, when saidright-handwinding is fully energized it differentiates the effect of the nuiddl'ewinding, and the relay in consequence re-' leases its armature. Therelease of relay 106 opens the circuit of stepping magnet 124 and thelatter becomes deenergized.

Relay 121, upon energizing, closes a circuit for the stepping magnet 119of the control switch 120. Magnet 119 operates'and prepares to advancethe brushes 112, 116, 133, etc. from the first position to the secondposition. This switch is so constructed that the brushes are not movedforward until.

the stepping magnet deenergizes.

In the meantime, the subscribers'line is closed at the end of the firstinterruption and the circuit through the" left-hand winding of relay 108and the left-hand winding ofcoil 107 is reestablished. Hence, relay 108remains energized from one interruption to the next,- assummg that thesubscrlbers line closes before the relay 106 has time to'deenergize onthe preceding interruption. j

Should, however, the relay 106 become differentiated and release to openthe circuit series of operations occur and the magnet 124 advances thebrushes of the register switch from position to position. During theseries of interruptions, slow-to-release relay 121 remains energized tohold the circuit of magnet 119 closed. At the termination of the firstseries, a suflicient interval elapses to permit the deenergization ofrelay 121. This relay opens the circuit of magnet 119, which in turn,releases to advance the brushes 112, 116, etc. of the control switch 120on to their second position terminals.

With the subscribers line closed preparatory to sending the secondseries of interruptions, the circuit previously traced through theleft-hand winding of relay 108 and the left-hand winding of coil 107 isestablished and the condenser 109 is shunted and-discharged asexplained. VVith the control switch 120, however, in position 2, thefollowing circuit is established: battery, through the right-handwinding of relay 108, middle winding of relay 106, conductor 131, brush112, terminal 114, contact of magnet 125 of the second register 115,conductor 130, winding of relay'121, brush 116, terminal 118. condenser128, resistance 129 to ground. The condenser 128 is charged in thiscircuit.

For each interruption of the second series the relay 106 is operated bya momentary current induced in the circuits including its left-hand andmiddle windings, respectively, and an impulse is delivered to thestepping magnet 125 of the second register'switch 115. At the end of thesecond set of interruptions when the switch has been set to thecorresponding position, relay 121 becomes deenergized and the steppingmagnet 119 advances the control switch to its third position.

In a similar manner as many succeeding register switches or similardevices as necessary may be operated.

Vhen it is desired to release the registers the line is openedpermanently and relay 108 releases for a suflicient interval to permitrelay 111 to retract its armature. Relay 111 closes a circuit throughits contact, brush 133 and the associated terminals, contact and windingof magnet 119 to battery. Magnet 119 interrupts its own circuit andadvances the brushes to the releasing position where the registers 110,115 may be restored in any well known manner.

hat is claimed is:

1. The combination with a line circuit having a source of currenttherein, of a plurality of other circuits, a relay having a winding ineach of said other circuits, means for changing the flow of current insaid line circuit, the change or" current in said line circuit inducinga flow of current in each of said other circuits, said relay respondingto the current induced in said other circuits, and a variable operabledevice actuated by said relay.

2. The combination with a line circuit and a source of current therein,of a number of other circuits, a relay having a separate windingassociated with each of said other circuits, means for repeatedlyopening and closing said line circuit, the change of current in saidline circuit caused by each opening thereof inducing a flow of currentin each of said other circuits, said relay responsive to the flow ofcurrent induced in said other circuits, and a variably operable switchactuated at each operation of said relay.

3. The combination with a line circuit having a source of currenttherein, of a plurality of other circuits, a relay having a plurality ofwindings, one included in each of said other circuits, means forchanging the flow of current in said line circuit, the change of currentin the line circuit. induc-- ing a momentary flow of current in saidother circuits, said relay responding to the flow of current induced insaid other circuits, means for maintaining said relay operated after themomentary current ceases to flow, and a variably operable deviceactuated by said relay.

4. The combination with a circuit having, a source of current therein,of a second circuit, a relay having a winding insaid second circuit, acondenser in said secondcircuit, means for altering the flowof currentin said first circuit, the change of current in said first circuitinducing a current in said second circuit which charges the condenserand flows through said winding, said relay responding to said inducedcurrent, and means controlled by said relay.

5. The combination with a line circuit having a source-of currentthere-in, of a second circuit, a relay having a winding in said secondcircuit, a condenser in said second circuit arranged to be charged bythe source of current in said line, means for changing the flow ofcurrent in said line, the change of current in the line circuit inducinga current in said second circuit which charges the condenser and flowsthrough said winding, said relay responding to the induced current, anda variably operable switch actuated by said relay. 7

6. The combination with a line circuit having a source of currenttherein, of a plurality of other circuits, a relay having awindingassociated with each of said other circuits, a condenser in each of saidother circuits, said condensers arranged to be charged by the source ofcurrent in said line circuit, means for changing the flow of current insaid line, the change of current in said line circuit inducing a currentin each of said other circuits which charges the respective condensersand flows 'through the corresponding windings of said relay, and avariably operable device actuated by said relay;

7.. The combination with a line circuit having a source of currenttherein, of a second circuit, means for changing the flow of current insaid line circuit, the change of current in. said l-i-ne circuitinducing a 'momentary flow of current in said second circuit, a relayresponsive to the current induced in said second circuit, aprogressively operable device actuated on each operation of said relay,and means for holding said relay operated until said device hascompleted its operation.

8. The combination with a line circuit having a source ofcurrenttherein, of asecond circuit, a relay having'a winding in said secondcircuit, means for repeatedly opening' and closing the line'circuit, thechange of current in said line circuit due to each opening, thereofinducing a momentary flow of current in said second circuit, said relayresponding to each momentary flow of cur rent in said second circuit, aprogressively operable switch actuated at each operation of said relay,and means for maintaining the operation'of said relay until saidswitchihas taken a full operation.

9. The combination with a line circuit having a source of currenttherein, of a second circuit, a relay having a winding in said secondcircuit, means for changing the flow of current in the line circuit,each change of current in said line inducing a momentary fiow of currentin said second circuit, said relay responding to the currents induced incurrent in said line inducing a flow of current in said secondcircuit'for operating said relay, a step-by-step switch operated on eachoperation of said relay, and a differential winding for said relayrendered efiective by said switch for causing the relay to release. 11.The combination of a line, means to transmit impulses over said line, aline relay, means to maintain said relay operated during the sendingof aseries of impulses, and a second relay actuated'in response to theinductive action of each impulse. on said line relay. 7

12. The combination of a line, means to transmit impulses over saidline, a relay connectedto said line and arranged to remain energizedduring the sending of a series of impulses, a second relay actuated in'response tothe effect of said impulses on'tlie firstrelay, a devicearranged to take a setting in response to said second relay, and releasempans for said device controlled by said first re ay.

In witness whereof, I hereunto subscribe my name this 19th day of June,A. D. 1922.

TVALTER P. ALBERT,

